Electric heater.



PATENTED JAN. 8, 1907.

N. N. S. MATCOVITCH. ELECTRIC HEATER. APPLICATION FILED 1.111.253 190e.

V i l I 1 Mfg/5:54625:

-UNITED STATES PATENT OFFICE.

NICHOLAS l N. s. MATCOVITCH, or SAN FRANCISCO, CALIFORNIA, ASSIGNOR fro J. EARLMOORE, OF LOS ANGELES, CALIFORNIA.

ELECTRIC HEATER..

Specification of Letters Patent.

' Patented Janps, 19o?.-

To all whom it may concern,.-

v Be it known that I, NICHOLAS vN. S. MAT- COVITOH, a citizen of the United States, residing in the city and county of San Francisco and State of Californla, have invented new and useful Im rovements in Electric Heaters, of whicht e following is a specification. My invention relates to electric heaters, pertains especially `to electrically-heated fabrics. Its object is to provide a exible electric heater suitable for use articularly in the sick-room and in hospita s, and\which maybe variousl Yemployed either as a bedcovering or bla et,hav1ng means for locally appl heat, or as a table-cover,with pockets for t e rece tion of milk-bottles, waterbags, &c., Whic are to be kept constantly warm. 3

The invention consists ofthe parts and the construction and the combination of parts, as hereinafter more fully described and claimed,

. having reference to the accompanying drawigure 1 is a plan view representing diagrammatically m invention. Fig. 2 is a section in line X- Fig.\ 1. Fig. v3 is a sectional view throu h a pocket, representing a modification of tghe invention. Fi 4 is a section through a pocket of the evice of Fi 1.

the embodiment of m' invention I are one or more groups o resistances A A AZ 3 in series between two sheets of asbestos 2 or like flexible, insulating, non-iniiammable material, and inclose these sheets and the resistances between two wool or like blanketlinings 3, the wool and asbestos linings and l sheets Vbeing stitched or otherwise permanently Secured together. German silver wire or lother suitable high-resistance flexible conductors may be employed as electric heaters. One terminal of resistance A and an o posite terminal of an adjacent resistance X3 connect, by the wires 4, with any suitable source of electrical supply. This electric fabric or heater may be of any'desired size suitable for table-cloths, blankets,jpads, or

bandages. Any desired and appro riate wei ht or ualit of linin may be em oyed. Thi blanlget is ildapted fr use as a bgd-cov,- ering for adults or Infants, or it may be emloyed as a table-coverin for the purpose of erfiiling dishes warm in cd Weather. l e resistances are arranged in series in such manner as normall to heat e uably the entire surface of the b anket, and they are preferably connected alternately in shunt, as shown at 5, with a switch 6 in each lshuntcireuit, so that any one or more of the resistances may be out out without aiecting the' any article, like a milk-bottle, ot-water bag,

or anything else which is to be kept warm may be inserted and supported upright.

By having the resistances in shunt it enables the current and heat to be cut olf from all the pockets except those which are actually in-use. Furthermore, havin the resistances in shunt permits local app ications of heat to the body, such as are commonly effected by hot-water bags and like means, when the blanket is used for a bed-covering.

The intensity of the current may beproportioned to the number of resistances in use atany one time by any suitable form of controller or rheostat, as shown at 9. With the pointer 9 in the position indicated current is assumed to be assinF sistances A2 an A3, all the switches 6 in the shunt-circuits 5 except one being closed.

By making the electric covering of suitable size in the first lace and then folding it at the side and en s along the dotted lines a b c d, so as to double the Several' resistanceson themselves, and then stitchin the folded-up portions to thebod of the fa ric a series of electric ockets wi be formed which will have bot sides of their linings heated, as indicated in the sectional view of Fig. 3. The resistances may be connected in shunt, as before described, to allow the several pockets to be heated independently. l

A'doublewalled double-heated pocket of the above deseriptionis particularly useful for receiving v'arid; heating and keeping hot a 1 reservoir, such-asiseinployed-in conjunction with fountain-syringes. TheC reservoir,

through only the re- IOO ai .t y y said blankets provlded with one or more which is indicated at 10, is inserted into a pockets.

2. The combination with a pair of blank-A ets, of resistance-conductors secured therebetween and arranged in series, and shunt-circuit connections between alternate members of said resistances.

3. The combination with a pair of flexible non-conductor sheets, of' av series of resist;

ances secured therebetween and arranged in series,l shunt-circuit connections between alternate members of said resistances, and switches in said circuits to permit one or more of said resistanoes to be cut ont.

l 4. The combination with. a pairl of exible nenconductcr sheets-, of a series. of resistances secured therebetween and arranged in series, shunt-circuit connections between certain of said electrical conductors-,switches in said circuits to one 'or more of said. 1 `resistances to be out out, and pockets arranged re'lativeto said resistanees.

i 5. A covering of lem'ble materiel in which is embedded a plurality` of resistances, conductors arranged in series, pockets arranged' in said covenglproximate to the resistances,

and means for eating one pocket independ- ,V ent of the others.

6. A heater consisting of a plurality of su- Ierposed flexible non-conductor sheets with exbl'e resistance-conductors arranged between them, said sheets and conductors bent over on one or more sides to form pockets with the resistances disposed on a plural-ity ci? sides of a pocket.

7. An electric heater comprisinga 'plurality of su rposed flexible nonconduetor sheets with flexible resistance-conductbrs arranged between the sheets,'said sheets and conductors bent over to form a pocket with the resistanees disposed on two sides o1? the l 8. VAn electric heater comprising. ap uralit-y of' superposed iiexible non-conductor slwets` with: exible resistance-conductors. arranged between the sheets, said'slmeets and eonductors bent over to form 'a pocket with the re' sistances di ed on two sides of the ket,

said che@ airing an opening in the ttoin for t e passage of a tube on' the like.

In testimony whereof' I have hereunto set my hand in presence of two subscribing Witv messes. i

., i NCHOLAS N. S. MTCOVXTCH.

Witnesses: S. H. Nonnsng H. Newman.

eket.. 

